Most crop circles are made by weirdos walking around fields in the middle of the night – but not this one, UFO fans claim.

This one is actually made by aliens – to warn us about an asteroid hitting Earth, according to the tireless alien-hunters at UFO Sightings Daily.

Why they couldn’t just send us an email, or take over all the TV channels at once, like they do in Mars Attacks, is anyone’s guess.

The crop circle, seen in Argentina this month, is actually a diagram, warning about a huge meteor hitting Earth, according to Scott C Waring.

Waring – the man behind Mars sightings such as the baby polar bear – says, ‘Crop circles have been around for thousands of years, recorded in ancient literature, paintings and walls. Its been long believed that the circles are messages sent from the heavens to humans.